Abstract
The results of the study of the workability and wear resistance of the combined coating of the restored cylinder liners obtained by applying a layer of aluminum powder to the cast-iron base by cold gas-dynamic spraying with subsequent treatment by microarc oxidation were presented. (Research purpose) The research purpose is a comparative analysis of the tribotechnical properties of the conjugations "sleeve coated with cold gas-dynamic spraying and treatment with microarc oxidation-counter-sample 100Cr6" and "sleeve (SH25 in the delivery state)-counter-sample 100Cr6" (reference pairing). (Materials and methods) Conducted a study of the workability of materials of the reference and reconstructed conjugations according to RD 50-662-88 "Guidelines. Methods of experimental evaluation of frictional compatibility of materials of friction conjugations". Comparative bench tests were performed on the wear resistance of the reference and restored conjugates according to GOST 23.224-86 "Ensuring the wear resistance of products. Methods for assessing the wear resistance of restored parts". (Results and discussion) The optimal modes of long-term operation and the limits of the interface operability were determined during the stepwise loading of the reference and restored tribo-couplings. The run-in coefficient and the wear factor of the couplings were calculated. It was found that the restored coupling "sleeve coated with cold gas-dynamic spraying and microarc oxidation treatment-counter-sample 100Cr6" has similar run-in rates with the reference coupling, and its wear resistance exceeds the wear resistance of the reference coupling by more than two times. (Conclusions) High indicators of workability and wear resistance of the restored interface "sleeve coated with cold gas-dynamic spraying and microarc oxidation treatment-counter-sample 100Cr6" in comparison with the reference sleeve (from SCH25 in the state of delivery) provide an increase in its durability and indicate the expediency of using the combined method in the restoration of cylinder liners.
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